pps

Hi there, I have moved 6 months ago from EI to PPS only because I was tired of big weekly water changes. My tank is 120 Liters, with medium/high plants load, with medium fish load, medium/high (PAR around 70 st the bottom) with adasoil (about 2 years old), RO water, KH2, Ph 6.2 ( 1.1 unit down...